<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=11"/>
<meta name="generator" content="Doxygen 1.9.4"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>Flow: async/detail/task_qing_thread.cpp Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/searchdata.js"></script>
<script type="text/javascript" src="search/search.js"></script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
 <tbody>
 <tr id="projectrow">
  <td id="projectalign">
   <div id="projectname">Flow<span id="projectnumber">&#160;2.0.0</span>
   </div>
   <div id="projectbrief">Flow project: Full implementation reference.</div>
  </td>
 </tr>
 </tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.9.4 -->
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&amp;dn=expat.txt MIT */
var searchBox = new SearchBox("searchBox", "search",'Search','.html');
/* @license-end */
</script>
<script type="text/javascript" src="menudata.js"></script>
<script type="text/javascript" src="menu.js"></script>
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&amp;dn=expat.txt MIT */
$(function() {
  initMenu('',true,false,'search.php','Search');
  $(document).ready(function() { init_search(); });
});
/* @license-end */
</script>
<div id="main-nav"></div>
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
     onmouseover="return searchBox.OnSearchSelectShow()"
     onmouseout="return searchBox.OnSearchSelectHide()"
     onkeydown="return searchBox.OnSearchSelectKey(event)">
</div>

<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0" 
        name="MSearchResults" id="MSearchResults">
</iframe>
</div>

<div id="nav-path" class="navpath">
  <ul>
<li class="navelem"><a class="el" href="dir_ddc98e6e1a9e0f6adcacab8ac7c1f855.html">async</a></li><li class="navelem"><a class="el" href="dir_b5abf7709f04a6790223f09f199659e4.html">detail</a></li>  </ul>
</div>
</div><!-- top -->
<div class="header">
  <div class="headertitle"><div class="title">task_qing_thread.cpp</div></div>
</div><!--header-->
<div class="contents">
<a href="task__qing__thread_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#include &quot;<a class="code" href="task__qing__thread_8hpp.html">flow/async/detail/task_qing_thread.hpp</a>&quot;</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="preprocessor">#include &quot;<a class="code" href="config_8hpp.html">flow/log/config.hpp</a>&quot;</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &lt;boost/asio.hpp&gt;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &lt;boost/move/make_unique.hpp&gt;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#include &lt;boost/asio/executor_work_guard.hpp&gt;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="preprocessor">#include &lt;string&gt;</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="preprocessor">#include &lt;exception&gt;</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="preprocessor">#include &lt;cstdlib&gt;</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1async.html">flow::async</a></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span>{</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment">// Static initializations.</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="keyword">const</span> <span class="keywordtype">int</span> <a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a981c21354bafc012748707a301b89d3e">Task_qing_thread::S_BAD_EXIT</a> = 1;</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment">// Implementations.</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span> </div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"><a class="line" href="classflow_1_1async_1_1Task__qing__thread.html#abb03d1b5f50a2b6148da27139a2391da">   37</a></span><a class="code hl_function" href="classflow_1_1async_1_1Task__qing__thread.html#abb03d1b5f50a2b6148da27139a2391da">Task_qing_thread::Task_qing_thread</a>(<a class="code hl_class" href="classflow_1_1log_1_1Logger.html">flow::log::Logger</a>* logger_ptr, <a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">util::String_view</a> nickname_view,</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span>                                   <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow_1_1async.html#a968806f54b14c697fd76b3339a2bdbbf">Task_engine_ptr</a>&amp; task_engine_ptr, <span class="keywordtype">bool</span> own_task_engine,</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>                                   boost::promise&lt;void&gt;* done_promise_else_block,</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span>                                   <a class="code hl_class" href="classflow_1_1Function.html">Task</a>&amp;&amp; init_func_or_empty) :</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span>  <a class="code hl_namespace" href="namespaceflow.html">flow</a>::log::Log_context(logger_ptr, <a class="code hl_enumeration" href="namespaceflow.html#a3938730ab4b89daf13d027a5f620e7ce">Flow_log_component</a>::<a class="code hl_enumvalue" href="namespaceflow_1_1async.html#a0a06794b16b72f2829ce3353557c8485a4d7a5700444c0570af37b1f9bcc6eb1f">S_ASYNC</a>),</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span>  m_task_engine(task_engine_ptr), <span class="comment">// shared_ptr&lt;&gt; copy.</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span>  m_own_task_engine(own_task_engine)</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span>{</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span>  <span class="keyword">using </span>boost::promise;</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>  <span class="keyword">using </span>boost::asio::post;</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span>  <span class="keyword">using </span>boost::asio::make_work_guard;</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span>  <span class="keyword">using </span>boost::movelib::unique_ptr;</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>  <span class="keyword">using </span>boost::movelib::make_unique;</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>  <span class="keyword">using </span>std::exception;</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>  <span class="keyword">using </span>std::string;</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span>  <span class="keyword">using </span>std::exit;</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceflow_1_1util.html#af030c3119f060a9630afca31098a78a5">util::Thread</a>;</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceflow_1_1util.html#ac3e89a8a271b0ddc76ac2a0ce488dea4">util::Task_engine</a>;</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>  <span class="keyword">using </span><a class="code hl_class" href="classflow_1_1log_1_1Logger.html">log::Logger</a>;</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span>  <span class="keyword">using </span><a class="code hl_function" href="namespaceflow_1_1log.html#aaaaa1dcbf7c8dc99aceb2b6c217187fc">log::beautify_chrono_logger_this_thread</a>;</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span>  <span class="keyword">using </span>Task_engine_work = boost::asio::executor_work_guard&lt;Task_engine::executor_type&gt;;</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span>  <span class="keyword">using </span>Log_config = <a class="code hl_class" href="classflow_1_1log_1_1Config.html">log::Config</a>;</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span> </div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span>  assert(<a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a1f4a96efdc1820ddbb4a4bf49c0d38e6">m_task_engine</a>);</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>  <span class="keywordtype">string</span> nickname(nickname_view); <span class="comment">// We need an std::string below anyway, so copy this now.</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span> </div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span>  <span class="comment">// Some programs start tons of threads.  Let&#39;s be stingy with INFO messages.</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span> </div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span>  <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Task_qing_thread [&quot;</span> &lt;&lt; <span class="keyword">static_cast&lt;</span><span class="keyword">const </span><span class="keywordtype">void</span>*<span class="keyword">&gt;</span>(<span class="keyword">this</span>) &lt;&lt; <span class="stringliteral">&quot;] with nickname [&quot;</span> &lt;&lt; nickname &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>                <span class="stringliteral">&quot;will &quot;</span> &lt;&lt; (<a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a0a80c87ce824a15fb84a73d99f5d61ac">m_own_task_engine</a> ? <span class="stringliteral">&quot;have own Task_engine, probably with concurrency-hint=1&quot;</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span>                                              : <span class="stringliteral">&quot;share Task_engine&quot;</span>) &lt;&lt; <span class="stringliteral">&quot;: [@&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a1f4a96efdc1820ddbb4a4bf49c0d38e6">m_task_engine</a> &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span> </div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>  <span class="comment">/* We&#39;ll satisfy this `promise` inside the thread we are about to spawn -- as soon as it is up and run()ing which</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment">   * means post()s (etc.) will actually execute from that point on instead of continuing to get queued up.</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment">   * Then in the current thread we&#39;ll briefly await for the `promise` to be satisfied, then return from this ctor;</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment">   * or if they&#39;ve passed in their own done_promise (done_promise_else_block not null), then they&#39;ll need to</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment">   * do the satisfaction-awaiting themselves.</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment">   *</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment">   * The trial-balloon post()ed task is isn&#39;t necessary; post() is formally known to work</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment">   * across run()ning threads starting and stopping; even with</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment">   * other tasks pre-queued on the Task_engine (which our doc header contract explicitly says is allowed).  It&#39;s</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment">   * a nice trial balloon, and if there&#39;s something wrong, it&#39;ll block the constructor and make it really obvious;</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment">   * this has proven to be helpful for debugging/testing in my experience (ygoldfel).</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment">   *</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment">   * Update: done_promise has now been extended by a new API arg init_func_or_empty, to indicate in particular</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment">   * that we&#39;ve executed init_func_or_empty().  So, while waiting for the subsequent post()ed trial-balloon task</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment">   * to complete is arguably at best a nicety, nevertheless the fact that can only occur *after* init_func_or_empty()</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment">   * returns satisfies a *necessity* (to wit: that we don&#39;t satisfy done_promise until init_func_or_empty() returns). */</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>  unique_ptr&lt;promise&lt;void&gt;&gt; our_done_promise_or_null;</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>  promise&lt;void&gt;&amp; done_promise</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>    = done_promise_else_block ? *done_promise_else_block</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>                              : *(our_done_promise_or_null = make_unique&lt;promise&lt;void&gt;&gt;());</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span> </div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>  <span class="comment">/* As promised in our doc header apply any current verbosity override to the new thread.  After all, there&#39;s no</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment">   * opportunity for them to set the override, since there *is* no thread until we start it just now.</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment">   * For now memorize it; then immediately apply it in the young thread.  (If there is no override, that&#39;s just</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment">   * `sev_override == Sev::S_END_SENTINEL`; we need not even track it as a special case.) */</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>  <span class="keyword">const</span> <span class="keyword">auto</span> sev_override = *(Log_config::this_thread_verbosity_override());</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span> </div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>  <a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a75b218e1b5f137ead984588107ef02b0">m_worker_thread</a>.reset(<span class="keyword">new</span> <a class="code hl_typedef" href="namespaceflow_1_1util.html#af030c3119f060a9630afca31098a78a5">Thread</a>([<span class="keyword">this</span>, <span class="comment">// Valid throughout thread { body }.</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>                                    sev_override,</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span>                                    nickname = std::move(nickname), <span class="comment">// Valid throughout thread { body }.</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>                                    init_func_or_empty = std::move(init_func_or_empty),</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>                                    &amp;done_promise]() <span class="comment">// Valid until post({ body }) .set_value()s it.</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span>  {</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span>    <span class="keyword">auto</span> <span class="keyword">const</span> logger_ptr = <a class="code hl_function" href="classflow_1_1log_1_1Log__context.html#af4db395042b065b00398cd59845dcb4d">get_logger</a>();</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span> </div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span>    <span class="comment">// Before anything (at all) can log, begin the section where logging is limited to sev_override.</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span>    {</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span>      <span class="keyword">const</span> <span class="keyword">auto</span> sev_override_auto = Log_config::this_thread_verbosity_override_auto(sev_override);</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span> </div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span>      <span class="comment">// Now do the pre-loop work.</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span> </div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span>      Logger::this_thread_set_logged_nickname(nickname, logger_ptr); <span class="comment">// This INFO-logs a nice message.</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span> </div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>      <span class="comment">// Use standard beautified formatting for chrono durations/etc. output (and conversely input).</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>      <a class="code hl_function" href="namespaceflow_1_1log.html#aaaaa1dcbf7c8dc99aceb2b6c217187fc">beautify_chrono_logger_this_thread</a>(<a class="code hl_function" href="classflow_1_1log_1_1Log__context.html#af4db395042b065b00398cd59845dcb4d">get_logger</a>());</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span> </div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>      <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Worker thread starting.&quot;</span>);</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span> </div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>      <span class="keywordflow">if</span> (!init_func_or_empty.empty())</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>      {</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>        <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Thread initializer callback executing synchronously.&quot;</span>);</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span>        init_func_or_empty();</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span>        <span class="comment">// This is INFO, as it may be important to separate between post()ed tasks and the initial setup.</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>        <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Thread initializer callback execution finished.  Continuing event loop setup in this thread.&quot;</span>);</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span>      }</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span> </div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>      <span class="comment">// Pre-queue this before run().</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span>      post(*<a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a1f4a96efdc1820ddbb4a4bf49c0d38e6">m_task_engine</a>, [<span class="keyword">this</span>,</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span>                            &amp;done_promise]() <span class="comment">// done_promise is (by promise/future&#39;s nature) alive until .set_value().</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span>      {</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span>        <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a0a80c87ce824a15fb84a73d99f5d61ac">m_own_task_engine</a>)</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>        {</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>          <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;First task from Task_qing_thread [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] executing &quot;</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span>                         <span class="stringliteral">&quot;in that thread since not sharing Task_engine object with more threads.&quot;</span>);</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>        }</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>        <span class="keywordflow">else</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>        {</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span>          <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;First task from Task_qing_thread [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] executing.  &quot;</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>                         <span class="stringliteral">&quot;May or may not be in that thread since sharing Task_engine object with more threads.&quot;</span>);</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>        }</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span> </div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span>        <span class="comment">// Safe to say stuff can be post()ed, possibly to us, as we were post()ed and are executing indeed.</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>        done_promise.set_value();</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span>        <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;First task complete.&quot;</span>);</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span>      });</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span>      <span class="comment">/* If not sharing Task_engine, above will run soon from this new thread, from within the following -&gt;run().</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="comment">       * Otherwise it might run from any thread in pool of threads sharing Task_engine; possibly right now concurrently.</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">       * Even then, though, subsequent post()s (etc.) might land into this new thread as soon as the following call</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span><span class="comment">       * starts running in earnest. */</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span>    } <span class="comment">// const auto sev_override_auto = // Restore logging to normal (how it normally is at thread start).</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span> </div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span>    <span class="comment">// Avoid loop, thread exiting when no pending tasks remain.</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>    Task_engine_work avoid_task_engine_stop(make_work_guard(*<a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a1f4a96efdc1820ddbb4a4bf49c0d38e6">m_task_engine</a>));</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span> </div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>    <span class="comment">// Block -- wait for tasks to be posted on this thread&#39;s (possibly shared with other threads) Task_engine.</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span>    <a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a1f4a96efdc1820ddbb4a4bf49c0d38e6">m_task_engine</a>-&gt;run();</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span> </div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span>    <span class="comment">// Lastly, after everything -- as promised -- re-apply the same Sev override as during startup, for any last msgs.</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>    {</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span>      <span class="keyword">const</span> <span class="keyword">auto</span> sev_override_auto = Log_config::this_thread_verbosity_override_auto(sev_override);</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span> </div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span>      <span class="comment">// Now do the post-loop work.</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span> </div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span>      <span class="comment">/* m_task_engine-&gt;run() must have exited to have reached here.  The only reason this can happen, assuming no</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment">       * misuse of thread API(s?) by the user, is if stop() (or dtor which runs stop()) ran.  Or it threw exception. */</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span>      <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Event loop finished: Task_qing_thread [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] presumably being stopped!  &quot;</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span>                    <span class="stringliteral">&quot;Thread exit imminent.&quot;</span>); <span class="comment">// This is good to keep as INFO.</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span>    } <span class="comment">// const auto sev_override_auto =</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span> </div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span>    <span class="comment">/* Let&#39;s discuss handling of various terrible things that can occur inside -&gt;run() which is essentially the thread</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">     * body, even though boost.asio is deciding when to run the various pieces of code in that thread body.</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">     *</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment">     * Firstly conditions like SEGV (seg fault -- bad ptr dereference, etc.), FPE (division by zero, etc.),</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="comment">     * BUS (like seg fault but with code), etc., may occur and raise a signal via system functionality.  That is none</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span><span class="comment">     * of our concern; to the extent that we could trap such things and do something smart it would apply to threads</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span><span class="comment">     * not handled by us; so it&#39;s not within our purview.</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span><span class="comment">     *</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="comment">     * Secondly an assert() could fail (or, equivalently but much less likely, [std]::abort() could be called directly).</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment">     * abort() usually raises SIGABRT and, as such, anything we could do about this -- as in the preceding paragraph --</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="comment">     * would apply to all threads; so again not in our purview.</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span><span class="comment">     *</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span><span class="comment">     * Lastly an exception could be thrown.  If caught (within a given task loaded onto *m_task_engine) then that&#39;s no</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="comment">     * different from handling an error return of a C-style function and wouldn&#39;t reach us and is handled within the</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="comment">     * task; none of our concern or anyone&#39;s concern; it&#39;s handled.</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span><span class="comment">     *</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="comment">     * That leaves one last condition: An exception was thrown within a task loaded onto *m_task_engine and *not*</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="comment">     * caught within that task.  boost.asio shall *not* catch it; hence -&gt;run() above will be emitting an exception.</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span><span class="comment">     * We can do one of 2 things.  We can catch it; or not.  If we do catch it there&#39;s no way to continue the -&gt;run()</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span><span class="comment">     * in any fashion that would lead to anything but undefined behavior.  We could -&gt;run() again but what happens then</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span><span class="comment">     * is utterly unpredictable; it&#39;s trying to pretend an uncaught exception isn&#39;t exceptional.  The next least</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span><span class="comment">     * exceptional behavior for us would be to log something about the exception and then exit the thread the same</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span><span class="comment">     * was we do above when -&gt;run() returns gracefully (meaning event loop finished gracefully).  However, then the</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span><span class="comment">     * rest of the program would think maybe the thread exited gracefully -- but it didn&#39;t -- which again is pretending</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span><span class="comment">     * an uncaught exception isn&#39;t exceptional.  (@todo It&#39;s conceivable to make this an optional behavior specified</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment">     * by the *this creator.  However even then it would absolutely not be a correct default behavior; so we must</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">     * in this discussion decide what *is* correct *default* behavior.)</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment">     *</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">     * We&#39;ve now whittled down to these possible courses of action in the uncaught-exception-in-a-task scenario.</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">     *   - Catch it here; then:</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="comment">     *     -1- Inform the rest of the program in some reasonable way and let them deal with it; e.g., execute some</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span><span class="comment">     *         callback function passed to this ctor, wherein they can do what they want before the thread exits.  Or:</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span><span class="comment">     *     -2- Exit the entire program.</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span><span class="comment">     *   -3- Do not catch it here; let it fall through.</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span><span class="comment">     *</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span><span class="comment">     * Let&#39;s for now not do -1-; not because it&#39;s a bad idea (it&#39;s a decent idea optionally), but because it doesn&#39;t</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span><span class="comment">     * provide a good default behavior that will do the right thing without the user having to worry about it.</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span><span class="comment">     *</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span><span class="comment">     * -2- can be done, basically, either via exit(&lt;non-zero&gt;) or via abort().  exit(&lt;non-zero&gt;) is not good as a</span></div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span><span class="comment">     * default behavior: Printing the exception&#39;s .what() would be decent, but there&#39;s no guarantee this would be</span></div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span><span class="comment">     * flushed to any actual log (e.g., log file) due to the sudden exit() not through main().  In general this wrests</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span><span class="comment">     * control of the exit() code from the program writer and arbitrarily gives it to Flow.  abort(), however, is</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span><span class="comment">     * fine!  After all, an uncaught exception in a thread not managed by us indeed calls abort() through</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span><span class="comment">     * std::terminate() by default (std::terminate() can also be overridden program-wide).  Other than bypassing</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span><span class="comment">     * std::terminate(), then, it&#39;s the same behavior as is generally expected by default.  To not bypass</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span><span class="comment">     * std::terminate() we could instead rethrow the exception.</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span><span class="comment">     *</span></div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span><span class="comment">     * -3-, however, is even more direct.  If we let it fall through, std::terminate() -- the default behavior -- would</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span><span class="comment">     * simply be in effect without our inserting ourselves into the situation.  If that&#39;s all we want (and we&#39;ve now</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span><span class="comment">     * made a good case for it) then doing nothing is less entropy then doing something that results in the same thing.</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span><span class="comment">     *</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span><span class="comment">     * So -3- is strictly better due to lessened entropy alone -- all else being equal.  Is there anything about -2-</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span><span class="comment">     * that would make &quot;all else&quot; not equal?  Yes: we could log .what() first before re-throwing/aborting.</span></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span><span class="comment">     * This, however, would come at a major cost: By 1st catching the exception we&#39;d lose the stack trace information:</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span><span class="comment">     * any generated core would show the stack of the location here in the catch-location, not the original</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span><span class="comment">     * throw-location.  Between printing the exception message and getting the full stack trace in a potential core,</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span><span class="comment">     * the latter wins in practice by far.  At least, by default, we shouldn&#39;t be taking that possibility away.</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span><span class="comment">     *</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span><span class="comment">     * So that&#39;s why we do nothing.</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span><span class="comment">     *</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span><span class="comment">     * Last thought: Is there something one can do to *both* get the stack trace in a core file *and* print the</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span><span class="comment">     * exception .what()?  (For that matter, with boost.backtrace and similar, it should be possible to print a stack</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span><span class="comment">     * trace to the logs as well.)  The answer is yes, though it&#39;s not on us to do it.  One should do such work either</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span><span class="comment">     * in std::terminate() (by using std::set_terminate()) or, arguably even better, in a global SIGABRT handler.</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span><span class="comment">     * I am only mentioning it here as opportunistic advice -- again, it&#39;s not in our purview, as shown above. */</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span>  })); <span class="comment">// Thread body.</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span>  <span class="comment">// `nickname`, `init_task_or_empty` may now be hosed.</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span> </div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span>  <span class="keywordflow">if</span> (done_promise_else_block)</div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span>  {</div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Thread started -- confirmation that it is up shall be signalled to caller through a `promise`.&quot;</span>);</div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span>  }</div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span>  <span class="keywordflow">else</span></div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span>  {</div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Thread started -- awaiting confirmation it is up.&quot;</span>);</div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span>    done_promise.get_future().wait();</div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Confirmed thread started -- Task_qing_thread [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] ready.&quot;</span>);</div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span>  }</div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span>} <span class="comment">// Task_qing_thread::Task_qing_thread()</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span> </div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"><a class="line" href="classflow_1_1async_1_1Task__qing__thread.html#abd3046b2dee9df486ba2710cb0d6b2e3">  248</a></span><a class="code hl_function" href="classflow_1_1async_1_1Task__qing__thread.html#abd3046b2dee9df486ba2710cb0d6b2e3">Task_qing_thread::~Task_qing_thread</a>()</div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span>{</div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Task_qing_thread [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Destroying object.&quot;</span>);</div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span> </div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span>  <a class="code hl_function" href="classflow_1_1async_1_1Task__qing__thread.html#a6515b9f5240cea26b78e27ea99964ade">stop</a>();</div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span> </div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span>  <span class="comment">// Last thing logged on our behalf -- INFO.</span></div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span>  <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Task_qing_thread [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Thread was stopped/joined just now or earlier; &quot;</span></div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span>                <span class="stringliteral">&quot;destructor return imminent; Task_engine destruction *may* therefore also be imminent.&quot;</span>);</div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span>}</div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno">  258</span> </div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno"><a class="line" href="classflow_1_1async_1_1Task__qing__thread.html#a6515b9f5240cea26b78e27ea99964ade">  259</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1async_1_1Task__qing__thread.html#a6515b9f5240cea26b78e27ea99964ade">Task_qing_thread::stop</a>()</div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span>{</div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span>  <span class="comment">/* Subtlety: stop() is to be a harmless no-op if called twice.  We therefore perform an explicit check for it</span></div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span><span class="comment">   * and return if detected.  This isn&#39;t strictly necessary; Task_engine::stop() and Thread::join() do work if called</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span><span class="comment">   * again after calling them once, and they just no-op, as desired.  We do it because:</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span><span class="comment">   *   - It&#39;s cleaner: one less code path to have to reason about in terms of safety.</span></div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span><span class="comment">   *   - Less spurious/verbose logging.</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span><span class="comment">   *   - It&#39;s a tiny bit faster.</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span><span class="comment">   *</span></div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span><span class="comment">   * This isn&#39;t a mere corner case; the destructor calls us even if stop() was called explicitly earlier. */</span></div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> redundant = !<a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a75b218e1b5f137ead984588107ef02b0">m_worker_thread</a>-&gt;joinable(); <span class="comment">// A/k/a &quot;not-a-thread&quot; &lt;=&gt; &quot;not joinable.&quot;</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span> </div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span>  <span class="keywordflow">if</span> (redundant)</div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span>  {</div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Task_qing_thread [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Not waiting for worker thread &quot;</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span>                  <span class="stringliteral">&quot;[T&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a75b218e1b5f137ead984588107ef02b0">m_worker_thread</a>-&gt;get_id() &lt;&lt; <span class="stringliteral">&quot;] to finish, as it was already stop()ped earlier.&quot;</span>);</div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span>  }</div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span>  <span class="keywordflow">else</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span>  {</div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span>    <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Task_qing_thread [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Waiting for worker thread &quot;</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span>                  <span class="stringliteral">&quot;[T&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a75b218e1b5f137ead984588107ef02b0">m_worker_thread</a>-&gt;get_id() &lt;&lt; <span class="stringliteral">&quot;] to finish, as it was not stop()ped earlier.&quot;</span>);</div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span>  }</div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span>  <span class="comment">// Ensure we understand properly the relationship between Task_engine::stopped() and this thread&#39;s existence.</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span>  assert((!<a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a0a80c87ce824a15fb84a73d99f5d61ac">m_own_task_engine</a>) <span class="comment">// In this case, as promised, it&#39;s up to them to stop m_task_engine at some point.</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span>         || (<a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a1f4a96efdc1820ddbb4a4bf49c0d38e6">m_task_engine</a>-&gt;stopped() == redundant)); <span class="comment">// &amp;&amp; m_own_task_engine)</span></div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span>  <span class="keywordflow">if</span> (redundant)</div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span>  {</div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span>  }</div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span>  <span class="comment">// else OK; this is the first stop() call.  Do as we promised.</span></div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span> </div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span>  <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a0a80c87ce824a15fb84a73d99f5d61ac">m_own_task_engine</a>)</div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span>  {</div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span>    <a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a1f4a96efdc1820ddbb4a4bf49c0d38e6">m_task_engine</a>-&gt;stop(); <span class="comment">// Trigger our owned Task_engine to execute no futher tasks and hence exit run().</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span>  }</div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span>  <span class="comment">// else { Caller will have to do something similar before the following statement is able to return. }</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span> </div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span>  <a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a75b218e1b5f137ead984588107ef02b0">m_worker_thread</a>-&gt;join();</div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span>  <span class="comment">// Mirror the top of this method.</span></div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span>  assert(!<a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a75b218e1b5f137ead984588107ef02b0">m_worker_thread</a>-&gt;joinable());</div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span>  assert((!<a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a0a80c87ce824a15fb84a73d99f5d61ac">m_own_task_engine</a>) || <a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a1f4a96efdc1820ddbb4a4bf49c0d38e6">m_task_engine</a>-&gt;stopped());</div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span> </div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Task_qing_thread [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Thread stopped/joined; stop() return imminent.&quot;</span>);</div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span>} <span class="comment">// Task_qing_thread::stop()</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span> </div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno"><a class="line" href="classflow_1_1async_1_1Task__qing__thread.html#aaf0191625ae2613a7351dc0515398903">  304</a></span><a class="code hl_typedef" href="namespaceflow_1_1async.html#a968806f54b14c697fd76b3339a2bdbbf">Task_engine_ptr</a> <a class="code hl_function" href="classflow_1_1async_1_1Task__qing__thread.html#aaf0191625ae2613a7351dc0515398903">Task_qing_thread::task_engine</a>()</div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span>{</div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span>  <span class="keywordflow">return</span> <a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a1f4a96efdc1820ddbb4a4bf49c0d38e6">m_task_engine</a>;</div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span>}</div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span> </div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno"><a class="line" href="classflow_1_1async_1_1Task__qing__thread.html#a3f9a0071880455c00a993d36c6040ae5">  309</a></span><a class="code hl_typedef" href="namespaceflow_1_1util.html#af030c3119f060a9630afca31098a78a5">util::Thread</a>* <a class="code hl_function" href="classflow_1_1async_1_1Task__qing__thread.html#a3f9a0071880455c00a993d36c6040ae5">Task_qing_thread::raw_worker_thread</a>()</div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span>{</div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span>  <span class="keywordflow">return</span> <a class="code hl_variable" href="classflow_1_1async_1_1Task__qing__thread.html#a75b218e1b5f137ead984588107ef02b0">m_worker_thread</a>.get(); <span class="comment">// Valid until destructor.</span></div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span>}</div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span> </div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span>} <span class="comment">// namespace flow::async</span></div>
<div class="ttc" id="aclassflow_1_1Function_html"><div class="ttname"><a href="classflow_1_1Function.html">flow::Function</a></div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00512">common.hpp:512</a></div></div>
<div class="ttc" id="aclassflow_1_1async_1_1Task__qing__thread_html_a0a80c87ce824a15fb84a73d99f5d61ac"><div class="ttname"><a href="classflow_1_1async_1_1Task__qing__thread.html#a0a80c87ce824a15fb84a73d99f5d61ac">flow::async::Task_qing_thread::m_own_task_engine</a></div><div class="ttdeci">bool m_own_task_engine</div><div class="ttdoc">See constructor.</div><div class="ttdef"><b>Definition:</b> <a href="task__qing__thread_8hpp_source.html#l00268">task_qing_thread.hpp:268</a></div></div>
<div class="ttc" id="aclassflow_1_1async_1_1Task__qing__thread_html_a1f4a96efdc1820ddbb4a4bf49c0d38e6"><div class="ttname"><a href="classflow_1_1async_1_1Task__qing__thread.html#a1f4a96efdc1820ddbb4a4bf49c0d38e6">flow::async::Task_qing_thread::m_task_engine</a></div><div class="ttdeci">Task_engine_ptr m_task_engine</div><div class="ttdoc">See task_engine().</div><div class="ttdef"><b>Definition:</b> <a href="task__qing__thread_8hpp_source.html#l00265">task_qing_thread.hpp:265</a></div></div>
<div class="ttc" id="aclassflow_1_1async_1_1Task__qing__thread_html_a3f9a0071880455c00a993d36c6040ae5"><div class="ttname"><a href="classflow_1_1async_1_1Task__qing__thread.html#a3f9a0071880455c00a993d36c6040ae5">flow::async::Task_qing_thread::raw_worker_thread</a></div><div class="ttdeci">util::Thread * raw_worker_thread()</div><div class="ttdoc">Returns the util::Thread – a thin wrapper around the native OS thread handle – corresponding to the w...</div><div class="ttdef"><b>Definition:</b> <a href="task__qing__thread_8cpp_source.html#l00309">task_qing_thread.cpp:309</a></div></div>
<div class="ttc" id="aclassflow_1_1async_1_1Task__qing__thread_html_a6515b9f5240cea26b78e27ea99964ade"><div class="ttname"><a href="classflow_1_1async_1_1Task__qing__thread.html#a6515b9f5240cea26b78e27ea99964ade">flow::async::Task_qing_thread::stop</a></div><div class="ttdeci">void stop()</div><div class="ttdoc">Blocks the calling thread until the constructor-started thread has finished; if the underlying Task_e...</div><div class="ttdef"><b>Definition:</b> <a href="task__qing__thread_8cpp_source.html#l00259">task_qing_thread.cpp:259</a></div></div>
<div class="ttc" id="aclassflow_1_1async_1_1Task__qing__thread_html_a75b218e1b5f137ead984588107ef02b0"><div class="ttname"><a href="classflow_1_1async_1_1Task__qing__thread.html#a75b218e1b5f137ead984588107ef02b0">flow::async::Task_qing_thread::m_worker_thread</a></div><div class="ttdeci">boost::movelib::unique_ptr&lt; util::Thread &gt; m_worker_thread</div><div class="ttdoc">Thread created in constructor. Not-a-thread after stop(); not not-a-thread before stop().</div><div class="ttdef"><b>Definition:</b> <a href="task__qing__thread_8hpp_source.html#l00271">task_qing_thread.hpp:271</a></div></div>
<div class="ttc" id="aclassflow_1_1async_1_1Task__qing__thread_html_a981c21354bafc012748707a301b89d3e"><div class="ttname"><a href="classflow_1_1async_1_1Task__qing__thread.html#a981c21354bafc012748707a301b89d3e">flow::async::Task_qing_thread::S_BAD_EXIT</a></div><div class="ttdeci">static const int S_BAD_EXIT</div><div class="ttdoc">exit() code returned to OS in the event Task_qing_thread chooses to exit() the entire program (as of ...</div><div class="ttdef"><b>Definition:</b> <a href="task__qing__thread_8hpp_source.html#l00070">task_qing_thread.hpp:70</a></div></div>
<div class="ttc" id="aclassflow_1_1async_1_1Task__qing__thread_html_aaf0191625ae2613a7351dc0515398903"><div class="ttname"><a href="classflow_1_1async_1_1Task__qing__thread.html#aaf0191625ae2613a7351dc0515398903">flow::async::Task_qing_thread::task_engine</a></div><div class="ttdeci">Task_engine_ptr task_engine()</div><div class="ttdoc">Returns pointer to util::Task_engine such that post()ing to it will cause the subsequent asynchronous...</div><div class="ttdef"><b>Definition:</b> <a href="task__qing__thread_8cpp_source.html#l00304">task_qing_thread.cpp:304</a></div></div>
<div class="ttc" id="aclassflow_1_1async_1_1Task__qing__thread_html_abb03d1b5f50a2b6148da27139a2391da"><div class="ttname"><a href="classflow_1_1async_1_1Task__qing__thread.html#abb03d1b5f50a2b6148da27139a2391da">flow::async::Task_qing_thread::Task_qing_thread</a></div><div class="ttdeci">Task_qing_thread(flow::log::Logger *logger_ptr, util::String_view nickname, const Task_engine_ptr &amp;task_engine, bool own_task_engine, boost::promise&lt; void &gt; *done_promise_else_block=0, Task &amp;&amp;init_func_or_empty=Task())</div><div class="ttdoc">Constructs object, immediately spawning new (worker) thread, memorizing a ref-counted reference to th...</div><div class="ttdef"><b>Definition:</b> <a href="task__qing__thread_8cpp_source.html#l00037">task_qing_thread.cpp:37</a></div></div>
<div class="ttc" id="aclassflow_1_1async_1_1Task__qing__thread_html_abd3046b2dee9df486ba2710cb0d6b2e3"><div class="ttname"><a href="classflow_1_1async_1_1Task__qing__thread.html#abd3046b2dee9df486ba2710cb0d6b2e3">flow::async::Task_qing_thread::~Task_qing_thread</a></div><div class="ttdeci">~Task_qing_thread()</div><div class="ttdoc">stop(), followed by forgetting the Task_engine returned by task_engine(); the latter action may destr...</div><div class="ttdef"><b>Definition:</b> <a href="task__qing__thread_8cpp_source.html#l00248">task_qing_thread.cpp:248</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Config_html"><div class="ttname"><a href="classflow_1_1log_1_1Config.html">flow::log::Config</a></div><div class="ttdoc">Class used to configure the filtering and logging behavior of Loggers; its use in your custom Loggers...</div><div class="ttdef"><b>Definition:</b> <a href="config_8hpp_source.html#l00316">config.hpp:317</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Log__context_html_af4db395042b065b00398cd59845dcb4d"><div class="ttname"><a href="classflow_1_1log_1_1Log__context.html#af4db395042b065b00398cd59845dcb4d">flow::log::Log_context::get_logger</a></div><div class="ttdeci">Logger * get_logger() const</div><div class="ttdoc">Returns the stored Logger pointer, particularly as many FLOW_LOG_*() macros expect.</div><div class="ttdef"><b>Definition:</b> <a href="log_8cpp_source.html#l00217">log.cpp:217</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Logger_html"><div class="ttname"><a href="classflow_1_1log_1_1Logger.html">flow::log::Logger</a></div><div class="ttdoc">Interface that the user should implement, passing the implementing Logger into logging classes (Flow'...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01280">log.hpp:1284</a></div></div>
<div class="ttc" id="aconfig_8hpp_html"><div class="ttname"><a href="config_8hpp.html">config.hpp</a></div></div>
<div class="ttc" id="alog_8hpp_html_a325fdd4b5cf0be49b37d3b7b7c29070d"><div class="ttname"><a href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a></div><div class="ttdeci">#define FLOW_LOG_INFO(ARG_stream_fragment)</div><div class="ttdoc">Logs an INFO message into flow::log::Logger *get_logger() with flow::log::Component get_log_component...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00197">log.hpp:197</a></div></div>
<div class="ttc" id="alog_8hpp_html_affcf2e4c496ce3f42adf981669c623b8"><div class="ttname"><a href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a></div><div class="ttdeci">#define FLOW_LOG_TRACE(ARG_stream_fragment)</div><div class="ttdoc">Logs a TRACE message into flow::log::Logger *get_logger() with flow::log::Component get_log_component...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00227">log.hpp:227</a></div></div>
<div class="ttc" id="anamespaceflow_1_1async_html"><div class="ttname"><a href="namespaceflow_1_1async.html">flow::async</a></div><div class="ttdoc">Flow module containing tools enabling multi-threaded event loops operating under the asynchronous-tas...</div><div class="ttdef"><b>Definition:</b> <a href="async__fwd_8hpp_source.html#l00074">async_fwd.hpp:75</a></div></div>
<div class="ttc" id="anamespaceflow_1_1async_html_a0a06794b16b72f2829ce3353557c8485a4d7a5700444c0570af37b1f9bcc6eb1f"><div class="ttname"><a href="namespaceflow_1_1async.html#a0a06794b16b72f2829ce3353557c8485a4d7a5700444c0570af37b1f9bcc6eb1f">flow::async::Synchronicity::S_ASYNC</a></div><div class="ttdeci">@ S_ASYNC</div><div class="ttdoc">Simply post the given task to execute asynchronously in some execution context – as soon as the conte...</div></div>
<div class="ttc" id="anamespaceflow_1_1async_html_a968806f54b14c697fd76b3339a2bdbbf"><div class="ttname"><a href="namespaceflow_1_1async.html#a968806f54b14c697fd76b3339a2bdbbf">flow::async::Task_engine_ptr</a></div><div class="ttdeci">boost::shared_ptr&lt; util::Task_engine &gt; Task_engine_ptr</div><div class="ttdoc">Short-hand for reference-counting pointer to a mutable util::Task_engine (a/k/a boost::asio::io_conte...</div><div class="ttdef"><b>Definition:</b> <a href="async__fwd_8hpp_source.html#l00198">async_fwd.hpp:198</a></div></div>
<div class="ttc" id="anamespaceflow_1_1log_html_aaaaa1dcbf7c8dc99aceb2b6c217187fc"><div class="ttname"><a href="namespaceflow_1_1log.html#aaaaa1dcbf7c8dc99aceb2b6c217187fc">flow::log::beautify_chrono_logger_this_thread</a></div><div class="ttdeci">void beautify_chrono_logger_this_thread(Logger *logger_ptr)</div><div class="ttdoc">Sets certain chrono-related formatting on the given Logger in the current thread that results in a co...</div><div class="ttdef"><b>Definition:</b> <a href="log_8cpp_source.html#l00271">log.cpp:271</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_ac3e89a8a271b0ddc76ac2a0ce488dea4"><div class="ttname"><a href="namespaceflow_1_1util.html#ac3e89a8a271b0ddc76ac2a0ce488dea4">flow::util::Task_engine</a></div><div class="ttdeci">boost::asio::io_context Task_engine</div><div class="ttdoc">Short-hand for boost.asio event service, the central class of boost.asio.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00135">util_fwd.hpp:135</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_ae4dc52186797094b3040379ff19124c9"><div class="ttname"><a href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">flow::util::String_view</a></div><div class="ttdeci">Basic_string_view&lt; char &gt; String_view</div><div class="ttdoc">Commonly used char-based Basic_string_view. See its doc header.</div><div class="ttdef"><b>Definition:</b> <a href="string__view_8hpp_source.html#l00191">string_view.hpp:191</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_af030c3119f060a9630afca31098a78a5"><div class="ttname"><a href="namespaceflow_1_1util.html#af030c3119f060a9630afca31098a78a5">flow::util::Thread</a></div><div class="ttdeci">boost::thread Thread</div><div class="ttdoc">Short-hand for standard thread class.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00078">util_fwd.hpp:78</a></div></div>
<div class="ttc" id="anamespaceflow_html"><div class="ttname"><a href="namespaceflow.html">flow</a></div><div class="ttdoc">Catch-all namespace for the Flow project: A collection of various production-quality modules written ...</div><div class="ttdef"><b>Definition:</b> <a href="async__fwd_8hpp_source.html#l00074">async_fwd.hpp:75</a></div></div>
<div class="ttc" id="anamespaceflow_html_a3938730ab4b89daf13d027a5f620e7ce"><div class="ttname"><a href="namespaceflow.html#a3938730ab4b89daf13d027a5f620e7ce">flow::Flow_log_component</a></div><div class="ttdeci">Flow_log_component</div><div class="ttdoc">The flow::log::Component payload enumeration comprising various log components used by Flow's own int...</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00637">common.hpp:638</a></div></div>
<div class="ttc" id="atask__qing__thread_8hpp_html"><div class="ttname"><a href="task__qing__thread_8hpp.html">task_qing_thread.hpp</a></div></div>
</div><!-- fragment --></div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated on Fri Mar 28 2025 22:55:35 for Flow by&#160;<a href="https://www.doxygen.org/index.html"><img class="footer" src="doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.9.4
</small></address>
</body>
</html>
